private void EnterButton_Click(object sender, EventArgs e)
        {
            int    item   = int.Parse(itemTextBox.Text);
            double weight = Convert.ToDouble(weightTextBox.Text);
            double amount = item * weight;

            if (amount <= refg.RemainingWeight)
            {
                refg.CalculateWeight(item, weight);

                currentWeightTextBox.Text   = refg.CurrentWeight.ToString();
                remainingWeightTextBox.Text = refg.RemainingWeight.ToString();
                itemTextBox.Text            = "";
                weightTextBox.Text          = "";
            }
            else
            {
                MessageBox.Show("Your Given Amount Cannot be Entered. It will be Overflown.");
            }
        }